[H-TT18] Development and application of environmental traceability methods

[HTT18-04] Study of the Relationship between Slope Failure and Chemical Runoff Components in Granitic Areas

*kawagoe seiki¹, ayaka sato¹, shiho yabusaki² (1.Faculty of Symbiotic Systems science/Fukushima university, 2.Research institute for Humanity and Nature)

Keywords:Granite, Multi-elemental analysis, slope failure, weathering

In recent years, there has been a succession of record-breaking rainfall events throughout Japan. The amount and frequency of heavy rainfall are expected to increase due to climate change, and the development of innovative and highly effective technologies for disaster prevention that incorporate a wide range of science and technology is eagerly awaited in order to build a safe society. In Japan, where there is a vast amount of mountainous terrain, damage from landslides is common. Therefore, it is necessary to establish a measurement technology that can detect slope failure phenomena as soon as possible.
To address this issue, we attempted to identify the risk of sediment impact in a watershed by deriving the degree of geological weathering from the chemical characteristics of river water. In this study, we attempted to identify the risk of sediment impact in the basin by deriving the degree of weathering from the chemical characteristics of river water. In this study, we set the Abukuma Highland, which is a granite area, as a target site and tried to identify weathering by comparing the chemical composition with the information on the basin obtained from numerical maps and satellite images. As a result, we found that the outflow of chemical components increased significantly in the slope failure area.